Surfactant-stabilized organoalkoxysilane composition

Abstract

The present invention relates to organoalkoxysilane compositions which comprise at least one organoalkoxysilane S, and at least one anhydrous surfactant T, where the weight fraction of all of the organoalkoxysilanes S is 33% by weight, based on the weight of the organoalkoxysilane composition, and where the ratio of the weight sum of all of the organoalkoxysilanes S to the weight sum of all of the anhydrous surfactants T (S:T) has a value of from 5:1 to 1:2.

Description

FIELD OF THE INVENTION[0001]The invention relates to the field of organoalkoxysilanes.BACKGROUND ART[0002]Organoalkoxysilanes are known substances and have long been used as—for example—adhesion promoters. They are frequently also referred to by the skilled worker as silanes. They have alkoxysilane groups, which in contact with water—in liquid form or as atmospheric moisture—are able to hydrolyze to form a silanol group (Si—OH) and then crosslink to siloxane compounds. This can lead to instances of precipitation or hazing even after a very short time. This sensitivity is very pronounced in particular in polar organoalkoxysilanes, and also at basic pH, and therefore in particular in aminosilanes.[0003]When dealing with organoalkoxysilanes, therefore, it must be ensured that they are stored and processed to the exclusion of moisture. In many cases this leads in practice to difficulties, therefore, as for example if a pack is not impervious or if it has been opened and poorly closed.DI...

AI Technical Summary

Benefits of technology

[0055]The organoalkoxysilane compositions, particularly if they include aminosilanes as organoalkoxysilanes S, are significantly less sensitive to the effect of water during the storage period. This behavior is manifested more particularly when water, more particularly in the form of atmospheric moisture, is able to come into contact with the organoalkoxysilane compositions. Reasons for such contact may be, for example, packs which are not impervious. Thus in practice it may well be the case that original packs, for example, are not impervious, or that a storage container is poorly or imperviously reclosed after having been open for the first time, or that said container is exposed to the environment for a certain time with no sealing at all. Finally, the storage stability of the organoalkoxysilane compositions is greatly increased in comparison with the prior art if they are stored in vessels made of plastic. This is the case especially when the ratio of surface area to volume of the container is high—in other words, in the case of low-volume containers. The reason for this is that the plastics typically used for plastic containers, such as polyethylene or polypropylene, in many cases have an inadequate imperviousness to water vapor diffusion. For small volumes, therefore, silane compositions in accordance with the prior art are stored not in plastic containers for but instead in glass or metal containers. Consequently, through the possibility of using plastic containers storing the organoalkoxysilane compositions of the invention, there are massive cost advantages and weight advantages arising, and also additional freedoms in the design and configuration of the packaging.

[0056]The improved storage properties and / or reduced sensitivity to water during the storage period are apparent more particularly through the absence, or at least severe retardation, of the formation of precipitates or hazing.

Problems solved by technology

This can lead to instances of precipitation or hazing even after a very short time.

In many cases this leads in practice to difficulties, therefore, as for example if a pack is not impervious or if it has been opened and poorly closed.

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